Below
is a letter from 1929 confirming reception of WTIC in New Jersey:

Here
is the stamp referred to:

As well as an enclosure telling about WTIC:

The QSL Letter and enclosure are
courtesy of Mike Schultz. Check out his site The Reverse Time Page at
http://uv201.com/ a virtual hoard of early radios, vacuum
tubes, electric clocks, and unusual technological debris of the past. The stamp is part of the WTIC archives.